Alloy tool-steel.



' meant.

I Be it known that we, JAMns HEBER.

JAMES nnnnn-rnnknn, or READING, Ann BEETON H. nn LONGLOF srmnenon'r,

PENNSYLVANIA, ASSIGNOBS TO CENTER STEEL COMPANY, OF READING, PENN-SYLVANIA, A CORPORATION OF PENNSYLVANIA.

ALLOY TOOL-STEEL.

No Drawing.

To all whom it may 005.06%."

PARKER and BERTON H. DE Lone, both'citizens of the UnitedStates,,residing at, respectively, Reading and Springmont, in the countyof Berks and State of Pennsylvania,

' have invented certain new and useful Improvements in AlloyTool-Steel's, of which the following is a specification.

Our invention relates to high speed alloy tool-steels; and our "purposeis to provide an improved alloy steel of this class adapted as a novelfeature a distinctively high proto extend the limits of possible speedand cut, and to secure maximumservice within these limits, while atthesame time providing such malleability' 'and'machining qualities asW111 permit of satisfactory shaping for various uses. f A

Our invention contemplates the production of an alloy high speed toolsteel of the tungsten-chromium-vanadium type, having portion of cobaltwhich makes possible the securing of desired characteristic qualities insuch degree as have not heretofore been attained,-to .wit: malleability;machining softness; and,"when treated, red-hardness, withmaximumserviceabilit e As actually employed by us with very satisfactoryresults, our improved alloy steel contains the following elements aboutpercentages as stated,'to wit:

it will be seen that this alloy tot-ms a tungsten steel, having ordinarypercentages of tungsten and the quantitatively. on

Specification of Letters JPatent.

' iroelements, but characterized by the use of cobalt with iron inquantities vforming ointly the greatbulk of the alloy and roportionedapproximately one part of co alt to two parts of iron.

These proportions of iron and cobalt'cor- "respond substantiallywith theeutectic proemployed with such variations in the other Patented JulyI0,-IOI'I; Application filed .Tune 26, 1916. Serial No. 105,855. i

elements and their proportions as have here- I as ordinarily employed;The characterissubstantially eutectic proportions as stated andconstitutingthe the distinguishing e ect being the securing of maximumservice,- with increase of possible speed and cut, and in connectionwith toiore been used, with efl'ects similar in character to thosesecured by such variations tic featuresof our improved high speed alloytool-steel is the use of iron and cobalt eat bulk of the alloy;

capability for requisite shaping operations.

What we claim 1s:

'1. A tungsten-steel having a base c omposed of between 30% and 45% ofcobalt and between 55% and 70% of iron, said compound constituting thebulk of the alloy and the tungsten between 8% and 20% thereof.

2. An alloy tool-steel composed mainly of iron and cobalt proportionedapprom'mately two of iron to one of cobalt, 8% to 20% of tuned and .5%to 2.5%"of vanadium.

3. I alloy tool-steel composed mainly of and cobalt proportionedapprom'mately two of iron to one of cobalt, 8% to 20% of tungsten and.5% to 2.5% of vanadium and 1% to 6% of chromium.

y In testimony whereof we afiixour signatures.

JS HEBER PARKER. BERTON H. DE LONG.

